My walls are too bumpy to wall paper, I saw on a recent home program an idea to wall paper MDF boards to achieve a good effect, however they are quite heavy 6mm and I need to know how to fix them to my dining room wall. Can you help?

Hi Letty,
Would like to help, but don't understand the wall papering of MDF, sounds like some loony interior designers gone, well even loonier! What's going to happen with the joints and is it an added fire hazard?
If you have an uneven wall that your not happy. There's a few solution.
I'd firstly consider getting it replastered, or you could board over using dot and dab as a method then tape joints with easyfill and sand down.
MDF's for TV DIY bodgers in my book, but i'm old school.
Hope that my comments are helpfull, i'd guess they used something like no nails or pink grip to stick to walls or maybe but battens up it to screw to! Sounds logical.
BEST OF LUCK WITH WALL
KB